EP3121428B1 - Method for operating a large diesel engine, use of this method and large diesel engine - Google Patents
Method for operating a large diesel engine, use of this method and large diesel engine Download PDFInfo
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- EP3121428B1 EP3121428B1 EP16167075.7A EP16167075A EP3121428B1 EP 3121428 B1 EP3121428 B1 EP 3121428B1 EP 16167075 A EP16167075 A EP 16167075A EP 3121428 B1 EP3121428 B1 EP 3121428B1
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- 239000000446 fuel Substances 0.000 claims description 78
- 238000002485 combustion reaction Methods 0.000 claims description 68
- 239000007788 liquid Substances 0.000 claims description 53
- 230000001052 transient effect Effects 0.000 claims description 31
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 230000002000 scavenging effect Effects 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 15
- 239000002283 diesel fuel Substances 0.000 claims description 6
- 238000009420 retrofitting Methods 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims 5
- 230000000996 additive effect Effects 0.000 claims 5
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
- F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
- F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
- F02B69/04—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel for gaseous and non-gaseous fuels
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- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
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- F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
- F02D19/0657—Heavy or light fuel oils; Fuels characterised by their impurities such as sulfur content or differences in grade, e.g. for ships
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- F02D19/066—Retrofit of secondary fuel supply systems; Conversion of engines to operate on multiple fuels
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- F02D19/081—Adjusting the fuel composition or mixing ratio; Transitioning from one fuel to the other
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- F02D19/10—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
- F02D19/105—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous operating in a special mode, e.g. in a liquid fuel only mode for starting
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- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
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- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
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- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
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- F02D41/02—Circuit arrangements for generating control signals
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- F02D41/045—Detection of accelerating or decelerating state
Definitions
- the invention relates to a method for operating a large diesel engine, a large diesel engine and the use of the method according to the preamble of the independent claim of the respective category.
- Large diesel engines which may be designed as two-stroke or four-stroke engines, for example as longitudinally-scavenged two-stroke large diesel engines, are often used as propulsion units for ships or in stationary operation, e.g. used to drive large generators for generating electrical energy.
- the engines usually run for long periods in continuous operation, which places high demands on the reliability and availability. Therefore, for the operator in particular long maintenance intervals, low wear and an economical handling of the operating materials are central criteria.
- dual-fuel engines ie engines that can be operated with two different fuels.
- a gas eg, a natural gas such as LNG (liquefied natural gas), or a gas in the form of an autogas or other suitable for driving an internal combustion engine gas is burned while in a liquid mode, a suitable liquid fuel such as gasoline, diesel, heavy oil or other suitable liquid fuels can be burned in the same engine.
- the engines can be both two-stroke and four-stroke engines and it may be small, medium-sized but also large engines, especially also longitudinally purged two-stroke large diesel engines.
- the use of a dual-fuel engine is for example from the document US2002 / 0007805 A1 known.
- large diesel engine also means those large engines that can be operated except in diesel mode, which is characterized by the auto-ignition of the fuel, in a Otto operation, which is characterized by the spark ignition of the fuel, or in mixed forms of these two.
- large diesel engine also includes, in particular, the aforementioned dual-fuel engines and those large engines in which the self-ignition of the fuel is used for the spark ignition of another fuel.
- the fuel In liquid mode, the fuel is usually introduced directly into the combustion chamber of the cylinder and burns there according to the principle of auto-ignition.
- the gas mode it is known to mix the gas in the gaseous state with the purging air according to the Otto principle, so as to produce an ignitable mixture in the combustion chamber of the cylinder.
- the ignition of the mixture in the cylinder is usually carried out by a small amount of liquid fuel is injected at the right moment in the combustion chamber of the cylinder or in an antechamber, which then leads to the ignition of the air-gas mixture.
- Dual-fuel engine can be switched from gas mode to liquid mode during operation and vice versa.
- the purge or charge air is usually provided by a turbocharger, which generates a purge or supercharger pressure, which depends on the load of the engine and thus on the power or on the torque or the rotational speed of the engine.
- a turbocharger which generates a purge or supercharger pressure, which depends on the load of the engine and thus on the power or on the torque or the rotational speed of the engine.
- the mass of the air in the cylinder can be calculated and then for the respective required drive torque, which is generated by the engine, or for the desired speed determine a suitable amount of the gaseous fuel, which leads to an optimal combustion process for this operating condition ,
- the correct adjustment of the air-gas ratio is of crucial importance for a low-emission, efficient and economical operation of the engine. If the proportion of gas is too high, it will Air-gas mixture too rich. The combustion of the mixture takes place too fast or too early, which can lead to knocking of the engine. Since the combustion process is then no longer correctly matched to the piston movement in the cylinder, this also leads among other things to the fact that the combustion partly works against the movement of the piston.
- the object of the invention solving this object are characterized by the features of the independent claim of each category.
- the amount of gas supplied to an upper limit which is such that the combustion of the air-gas mixture in the cylinder does not fall within the range of too fast or knocking combustion, it is possible to use the gas mode even in the case of sudden combustion , frequent or periodic load changes or load changes continue to be used without the risk of inefficient, polluting and uneconomic operation.
- the lack of power due to the limited or reduced gas supply to achieve the desired setpoint speed is then generated by introducing in transient mode, in addition to the gas, a predetermined amount of liquid fuel into the cylinder, the combustion of which provides the lack of power.
- the large diesel engine is preferably designed as a dual-fuel engine for combustion of a gas and for combustion of a liquid fuel, in particular diesel or heavy oil.
- the method according to the invention thus makes it possible for a dual-fuel engine to be operated efficiently even in the case of sudden and frequent load changes in the gas mode. In the case of the important application example of a large diesel engine as the drive unit of a ship, this means that it can continue to be used efficiently even in heavy seas of the gas mode.
- the inventive method increases the smoothness of the engine and the speed fluctuations are significantly reduced.
- the transient mode is initiated manually.
- the operator can activate the transient mode of the engine when heavy swell occurs.
- the transient mode is initiated as a function of at least one of the following parameters: current pressure of the purge air, cylinder pressure, calculated air-to-gas ratio, signal of a knock detector, ratio of engine speed to load, change the ratio of engine speed to load, engine torque, torque change, amount of fuel needed for injection, change in amount of fuel needed for injection.
- the continuous or regular determination of at least one of these parameters also allows automatic activation of the transient mode.
- the additional amount of the liquid fuel can be introduced by means of an injection device into the combustion chamber, which is used in a liquid mode of the large diesel engine.
- the additional amount of the liquid fuel can be introduced by means of a pilot injection device into the combustion chamber, which is used in the gas mode for igniting the gas.
- the additional amount of the liquid fuel can be introduced by means of a separate injection device into the combustion chamber, which is provided for the transient mode.
- the supply of the gas into the cylinder can take place through a cylinder liner.
- Known gas supply systems are known per se, which are provided on the wall of the cylinder and introduce the gas through the cylinder liner into the interior of the cylinder.
- Such gas supply systems are preferably arranged to introduce the gas at a location in the cylinder which has a distance from the top or bottom dead center of the piston in the cylinder, in particular one which 40% -60%, preferably 50%, of the distance between the top dead center and the bottom dead center.
- the supply of the gas into the cylinder can also be done on a cylinder head. Also for this gas supply systems are known
- the gas can be supplied to the purging air before the purging air is introduced into the cylinder or when the purging air is introduced into the cylinder.
- the last-mentioned variant can in particular also be realized in such a way that one or more gas inlet nozzles are provided on one or more webs which separate adjacent scavenging air openings or scavenging air slots from one another.
- a large diesel engine is also proposed, which is operable at least in a gas mode and which is operated according to a method according to the invention.
- the large diesel engine is preferably designed as a dual-fuel engine for combustion of a gas and for combustion of a liquid fuel, in particular diesel or heavy oil.
- a motor control which comprises a control device for initiating and executing the transient mode.
- the use of a method according to the invention for retrofitting a large diesel engine, in particular a duel-fuel engine is proposed. Since the inventive method can be implemented in many cases without major additional equipment expense, it is particularly suitable for retrofitting already existing large diesel engines or retrofit, so this particular efficient in frequent and sudden load changes, for example in heavy seas, efficiently can be operated environmentally friendly.
- this embodiment of the large diesel engine can be operated in a liquid mode in which only a liquid fuel is injected into a combustion chamber of a cylinder.
- the liquid fuel such as heavy oil or diesel oil injected at a suitable time directly into the combustion chamber and ignites there according to the diesel principle of auto-ignition.
- the large diesel engine can also be operated in a gas mode in which serving as a fuel gas, such as natural gas, is brought in the form of an air-gas mixture in the combustion chamber for ignition.
- the large diesel engine operates in gas mode according to a low-pressure method, ie the gas is introduced into the cylinder in the gaseous state.
- the mixing with the air can take place in the cylinder itself or even before the cylinder.
- the air-gas mixture is in the combustion chamber after the Otto-Principle externally ignited. This spark ignition is usually caused by the fact that at a suitable moment a small amount of liquid fuel is introduced into the combustion chamber, which then self-ignites and thereby causes the spark ignition of the air-gas mixture.
- the large diesel engine can be configured both as a four-stroke engine and as a two-stroke engine.
- the large diesel engine is designed as a longitudinally flushed two-stroke large diesel engine, which operates in liquid mode with a common rail system.
- scavenging air slots are provided in the lower region of each cylinder or cylinder liner, which are periodically closed and opened by the movement of the piston in the cylinder, so that provided by the turbocharger under a boost pressure scavenging air through the Purging air slots can flow into the cylinder, as long as they are open.
- a usually centrally arranged exhaust valve is provided, through which the combustion gases can be discharged after the firing process from the cylinder into the exhaust system.
- the liquid fuel one or more fuel injection nozzles are provided, which are arranged for example in the cylinder head in the vicinity of the exhaust valve.
- a gas supply system which comprises at least one gas inlet valve with a gas inlet nozzle.
- the gas inlet nozzle is typically in the wall of the Cylinder provided, for example, at a height which is approximately in the middle between the top and bottom dead center of the piston.
- the efficiency and low-emission combustion of the air-gas mixture are very sensitive to the ratio of the amount of air and the amount of gas. This ratio is usually expressed by the ⁇ value, which is the ratio of the mass of air available for combustion and the mass of gas used as the fuel.
- the optimum air-to-gas ratio depends on the drive torque to be generated by the engine and thus on the desired speed of the ship. Since large diesel engines are usually connected directly to the ship's propeller, each speed corresponds to a speed of the engine.
- Fig. 1 shows a schematic representation of an exemplary relationship between the air-to-gas ratio 1 and the engine-generated torque 2, which drives the ship.
- This illustration applies to a particular torque, which corresponds to a certain speed of the ship - or a certain speed of the engine - as the ship moves in essentially calm waters.
- Torque 2 represented the BMEP (Brake Mean Effective Pressure) torque, which is essentially one over a work cycle (a period of piston movement for two-stroke engines and two Periods of piston movement for four-stroke engines) is averaged torque.
- BMEP Brain Mean Effective Pressure
- the air-gas mixture is too rich, that is there is too little air in the mixture. Too rich a mixture can lead to various problems, namely that the combustion takes place too fast (fast combustion) or that the engine begins to knock or the mixture in the cylinder then usually by auto-ignition due to the too high content of gas too early (based on the duty cycle) begins to burn (pre-ignition).
- the air-gas mixture is too lean, that is, there is not enough gas for optimal combustion in the combustion chamber available.
- Fig. 2 shows a schematic representation of an embodiment of the inventive method.
- the starting point is in a step 10 that the large diesel engine is operated in gas mode. If the ship is now in heavy seas, this state can be detected by observation of the operating personnel 11 and / or on the basis of the evaluation of operating parameters by the engine control or other control devices in step 12. If the heavy load changes caused thereby are judged to be too great, it is decided in a step 13 to switch the large diesel engine into a transient mode. In this transient mode, a setpoint for the speed or the torque to be generated by the motor is first determined. This may, for example, be the value which corresponds to the movement of the ship in calm water.
- the controller determines an upper limit on the amount of gas provided as fuel per cycle of operation of the large diesel engine.
- This upper limit is set so that the available purging air is sufficient to burn the maximum amount of gas defined by the upper limit in such a way that the range of "almost combustion" and / or knocking combustion is avoided; So gas mixture does not get too fat.
- the upper limit for the maximum allowable amount of gas to avoid exceeding the knock limit 3 depends on the mass of air present in the cylinder. At known Cylinder volume, this mass of air can be determined using the available boost pressure of the purge air. Of course, the fluctuations in the boost pressure are taken into account, ie it is advantageously from a minimum boost pressure, which is available in any case.
- a suitable upper limit for the amount of gas can of course also empirical values or other known operating variables of the large diesel engine incorporated.
- the currently available boost pressure of the scavenging air is used for determining the upper limit of the amount of gas.
- This charge pressure is usually detected by measurement in a large diesel engine and is thus available in the control device or can be transmitted to it.
- the determination of the upper limit for the gas quantity can be determined with the aid of the difference between the instantaneous value of the available charge pressure of the purging air and the required charge pressure of the purging air.
- the required boost pressure for the current operating parameters is stored, for example, in look-up tables or matrices.
- the control device then includes a charge pressure dependent upper limit for the amount of gas that can be supplied to the cylinder as fuel gas and limits the amount of gas to this upper limit.
- the controller further determines, in step 14, an additional amount of liquid fuel which is calculated to be the difference between the desired value for the speed or the torque and equalizes the value achievable with the maximum amount of gas.
- the controller determines that value for the torque or speed achievable with the maximum amount of gas defined by the upper limit. Then the difference between the setpoint and this value is determined. Subsequently, the amount of liquid fuel needed to make up for this difference is determined.
- the determined amount of gas is introduced into the cylinder in step 15 and brought there for combustion as in the gas mode.
- the previously determined amount of liquid fuel is introduced into the cylinder in step 16 and ignites itself there.
- the self-ignition of the liquid fuel can be used for the spark ignition of the air-gas mixture.
- step 17 is checked continuously or at regular intervals by observations of the operating staff and / or by the determination of the operating parameters, whether the conditions for the activation of the transient mode are still met. If so, the transient mode is maintained as indicated by arrow 18 in FIG Fig. 2
- the values for the upper limit of the amount of gas and for the additional amount of liquid fuel are checked or updated.
- step 19 it is possible to switch back to the normal gas mode.
- the control device for initiating and executing the transient mode is preferably integrated in the engine control.
- the setpoint for the engine speed i. the speed or set point for the torque is maintained without the combustion of the gas being in the range of "fast combustion" and / or knocking and / or pre-ignition on gas ensures that the air-gas mixture in the combustion chamber is not too rich.
- a dual-fuel large diesel engine which operates in gas mode according to the Otto principle, a reach at least approximately the same load change response, such as a working only on the diesel principle large diesel engine, which is operated exclusively with liquid fuel.
- the air-gas mixture does not become too rich in the process according to the invention or in the large diesel engine according to the invention, and on the other hand, the proportion of combustion associated with the liquid fuel is much less sensitive to an insufficient boost pressure of the scavenging air.
- the running stability of the large diesel engine can be improved and the speed fluctuations can be reduced.
- the schematic representation in Fig. 3 illustrates the interaction of the gas combustion and the combustion of the liquid fuel in the transient mode again by way of example.
- the torque T of the large diesel engine is plotted as a function of time t, as can occur in heavy seas.
- the high undulations to which the vessel is then exposed cause an approximately periodic change in the torque T.
- the curve G shows the proportion of the torque caused by the combustion of the gas, the maximum amount of gas being limited the available purging air is sufficient so that the air-gas mixture does not become too rich.
- the two curves with the reference symbol F, which delimit the hatched areas show the additional contribution to the torque T which is generated by the additional combustion of the liquid fuel.
- the large diesel engine is designed as a dual-fuel engine, can be used for the injection of liquid fuel, the same injector used in liquid mode for the injection of the fuel.
- liquid fuel is introduced by means of a pilot injection device into the combustion chamber, which is used in the gas mode for igniting the air-gas mixture.
- a gas supply system can be provided with at least one gas inlet nozzle, which is arranged in the cylinder liner, so that the gas can be introduced into the cylinder and mixed there with the purging air to the ignitable air-gas mixture.
- Another possibility is to supply the gas to the purging air before the purging air is introduced into the cylinder.
- the gas then already mixes outside the interior of the cylinder with the purging air to form an air-gas mixture, which is then introduced into the cylinder, for example through the purging air slots or purging air openings.
- the gas supply into the scavenging air at a point between the outlet of the turbocharger system and the inlet openings in the interior of the cylinder, for example, the scavenge air slots take place.
- the gas it is also possible to supply the gas to the purging air when the purging air is introduced into the cylinder.
- the operating parameters which in step 12 ( Fig. 2 ) are determined or analyzed to judge in step 13, whether to switch to the transient mode are preferably those parameters that are already present in the engine control, so anyway recorded for operation or during operation of the large diesel engine, or from such Parameters derivable quantities. It is also possible that only one operating parameter is used for the decision to switch to transient mode, or the decision to switch to transient mode is made solely on the basis of the observations by the operating personnel, which can also initiate the transient mode manually.
- one or more of the following quantities are suitable as operating parameters for step 12 or the decision in step 13:
- the inventive method can also be used in particular to retrofit existing large diesel engines, especially dual-fuel engines. Since in such large diesel engines the apparatus requirements for carrying out a method according to the invention are often already met or can be realized with little effort or conversion, it is often possible to make the large diesel engine ready for transient operation by appropriate adjustments or additions in the engine control. This possibility of retrofitting is a great advantage, especially with regard to compliance with the emission limit values.
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Description
Die Erfindung betrifft ein Verfahren zum Betreiben eines Grossdieselmotors, einen Grossdieselmotor und die Verwendung des Verfahrens gemäss dem Oberbegriff des unabhängigen Patentanspruchs der jeweiligen Kategorie.The invention relates to a method for operating a large diesel engine, a large diesel engine and the use of the method according to the preamble of the independent claim of the respective category.
Grossdieselmotoren, die als Zweitakt- oder als Viertakt-Maschinen ausgestaltet sein können, beispielsweise als längsgespülte Zweitakt-Grossdieselmotoren, werden häufig als Antriebsaggregate für Schiffe oder auch im stationären Betreib, z.B. zum Antrieb grosser Generatoren zur Erzeugung elektrischer Energie eingesetzt. Dabei laufen die Motoren in der Regel über beträchtliche Zeiträume im Dauerbetrieb, was hohe Anforderungen an die Betriebssicherheit und die Verfügbarkeit stellt. Daher sind für den Betreiber insbesondere lange Wartungsintervalle, geringer Verschleiss und ein wirtschaftlicher Umgang mit den Betriebsstoffen zentrale Kriterien.Large diesel engines, which may be designed as two-stroke or four-stroke engines, for example as longitudinally-scavenged two-stroke large diesel engines, are often used as propulsion units for ships or in stationary operation, e.g. used to drive large generators for generating electrical energy. The engines usually run for long periods in continuous operation, which places high demands on the reliability and availability. Therefore, for the operator in particular long maintenance intervals, low wear and an economical handling of the operating materials are central criteria.
Ein weiterer wesentlicher Punkt ist seit einigen Jahren mit zunehmender Bedeutung die Qualität der Abgase, insbesondere die Stickoxid Konzentration in den Abgasen. Hier werden die rechtlichen Vorgaben und Grenzwerte für die entsprechenden Abgasgrenzwerte immer weiter verschärft. Das hat insbesondere bei Zweitakt-Grossdieselmotoren zur Folge, dass die Verbrennung des klassischen, mit Schadstoffen hoch belasteten Schweröls, aber auch die Verbrennung von Dieselöl oder anderen Brennstoffen problematischer wird, weil die Einhaltung der Abgasgrenzwerte immer schwieriger, technisch aufwändiger und damit teurer wird oder am Ende deren Einhaltung gar nicht mehr sinnvoll möglich Aus der
In der Praxis besteht daher bereits seit langem das Bedürfnis nach sogenannten "Dual-Fuel Motoren", also Motoren, die mit zwei unterschiedlichen Brennstoffen betrieben werden können. In einem Gasmodus wird ein Gas, z.B. ein Erdgases wie LNG (liquefied natural gas), oder ein Gas in Form eines Autogases oder eines anderen zum Antrieb einer Brennkraftmaschine geeigneten Gases verbrannt, während in einem Flüssigmodus ein geeigneter flüssiger Brennstoff wie Benzin, Diesel, Schweröl oder andere geeignete flüssige Brennstoffe in demselben Motor verbrannt werden können. Die Motoren können dabei sowohl Zweitakt- als auch Viertaktmotoren sein und es kann sich dabei um kleine, mittelgrosse aber auch um Grossmotoren, insbesondere auch um längsgespülte Zweitakt-Grossdieselmotoren handeln. Die Verwendung eines Dual-Fuel Motor ist beispielsweise aus den Dokument
Mit dem Begriff "Grossdieselmotor" sind auch solche Grossmotoren gemeint, die ausser im Dieselbetrieb, der durch die Selbstzündung des Brennstoffs gekennzeichnet ist, auch in einem Ottobetrieb, der durch die Fremdzündung des Brennstoffs gekennzeichnet ist, oder in Mischformen aus diesen beiden betrieben werden kann. Ferner umfasst der Begriff Grossdieselmotor insbesondere auch die genannten Dual-Fuel-Motoren und solche Grossmotoren, bei denen die Selbstzündung des Brennstoffs zur Fremdzündung eines anderen Brennstoffs genutzt wird.The term "large diesel engine" also means those large engines that can be operated except in diesel mode, which is characterized by the auto-ignition of the fuel, in a Otto operation, which is characterized by the spark ignition of the fuel, or in mixed forms of these two. In addition, the term "large diesel engine" also includes, in particular, the aforementioned dual-fuel engines and those large engines in which the self-ignition of the fuel is used for the spark ignition of another fuel.
Im Flüssigmodus wird üblicherweise der Brennstoff direkt in den Brennraum des Zylinders eingebracht und verbrennt dort nach dem Prinzip der Selbstzündung. Im Gasmodus ist es bekannt, nach dem Otto-Prinzip das Gas im gasförmigen Zustand mit der Spülluft zu vermischen, um so im Brennraum des Zylinders ein zündfähiges Gemisch zu erzeugen. Bei diesem Niederdruckverfahren erfolgt die Zündung des Gemisches im Zylinder üblicherweise, indem im richtigen Moment eine kleine Menge flüssiger Brennstoff in den Brennraum des Zylinders oder in eine Vorkammer eingespritzt wird, die dann zur Zündung des Luft-Gas-Gemisches führt. Ein Dual-Fuel Motor kann während des Betriebs vom Gasmodus in den Flüssigmodus umgeschaltet werden und umgekehrt.In liquid mode, the fuel is usually introduced directly into the combustion chamber of the cylinder and burns there according to the principle of auto-ignition. In the gas mode, it is known to mix the gas in the gaseous state with the purging air according to the Otto principle, so as to produce an ignitable mixture in the combustion chamber of the cylinder. In this low-pressure method, the ignition of the mixture in the cylinder is usually carried out by a small amount of liquid fuel is injected at the right moment in the combustion chamber of the cylinder or in an antechamber, which then leads to the ignition of the air-gas mixture. On Dual-fuel engine can be switched from gas mode to liquid mode during operation and vice versa.
Aber auch reine Gasmotoren, also Motoren, die nur mit Gas und nicht alternativ noch mit Diesel, Schweröl oder einem anderen Brennstoff betreibbar sind werden nachgefragt, insbesondere dann, wenn hohe Abgasstandards gefordert sind, die mit vertretbarem technischen Aufwand wirtschaftlich sinnvoll nur durch die Verbrennung von Gas eingehalten werden können. Ein solcher reiner Gasmotor ist beispielweise in der
Ganz gleich ob es sich um einen Dual-Fuel Motor oder um einen reinen Gasmotor handelt ist der Vorgang der Einbringung des Brennstoffs Gas in den Brennraum des Zylinders einer entsprechenden Hubkolbenbrennkraftmaschine von entscheidender Bedeutung für den zuverlässigen, schadstoffarmen und sicheren Betrieb eines solchen Motors.Whether it is a dual-fuel engine or a pure gas engine is the process of introducing the fuel gas into the combustion chamber of the cylinder of a corresponding reciprocating internal combustion engine of crucial importance for the reliable, low-pollution and safe operation of such an engine.
Im Gasmodus ist insbesondere das Einstellen des korrekten Verhältnisses von Spülluft zu Gas, das sogenannte Luft/Kraftstoffverhältnis, von entscheidender Bedeutung. In einem Grossdieselmotor wird die Spül- oder Ladeluft üblicherweise von einem Turbolader zur Verfügung gestellt, der einen Spül- oder Ladeluftdruck generiert, welcher von der Last des Motors und damit von der Leistung bzw. vom Drehmoment bzw. der Drehzahl des Motors abhängt. Für einen gegebenen Spülluftdruck lässt sich die Masse der Luft im Zylinder berechnen und dann für das jeweilige benötigte Antriebsmoment, welches vom Motor generiert wird, bzw. für die gewünschte Drehzahl eine geeignete Menge des gasförmigen Brennstoffs bestimmen, der für diesen Betriebszustand zu einem optimalen Verbrennungsprozess führt.In the gas mode in particular the setting of the correct ratio of purging air to gas, the so-called air / fuel ratio, is of crucial importance. In a large diesel engine, the purge or charge air is usually provided by a turbocharger, which generates a purge or supercharger pressure, which depends on the load of the engine and thus on the power or on the torque or the rotational speed of the engine. For a given purge air pressure, the mass of the air in the cylinder can be calculated and then for the respective required drive torque, which is generated by the engine, or for the desired speed determine a suitable amount of the gaseous fuel, which leads to an optimal combustion process for this operating condition ,
Insbesondere, wenn der Gasmodus nach dem Otto-Prinzip betrieben wird, ist die korrekte Einstellung des Luft-Gas-Verhältnisses von entscheidender Bedeutung für einen möglichst schadstoffarmen, effizienten und wirtschaftlichen Betrieb des Motors. Ist der Gasanteil zu hoch, so wird das Luft-Gas-Gemisch zu fett. Die Verbrennung des Gemischs erfolgt zu schnell oder zu früh was zum Klopfen des Motors führen kann. Da der Verbrennungsprozess dann nicht mehr korrekt auf die Kolbenbewegung im Zylinder abgestimmt ist, führt dies unter anderem auch dazu, dass die Verbrennung teilweise gegen die Bewegung des Kolbens arbeitet.In particular, if the gas mode is operated according to the Otto principle, the correct adjustment of the air-gas ratio is of crucial importance for a low-emission, efficient and economical operation of the engine. If the proportion of gas is too high, it will Air-gas mixture too rich. The combustion of the mixture takes place too fast or too early, which can lead to knocking of the engine. Since the combustion process is then no longer correctly matched to the piston movement in the cylinder, this also leads among other things to the fact that the combustion partly works against the movement of the piston.
Auch wenn die korrekte Einstellung des Luft-Gas-Verhältnisses in modernen Grossdieselmotoren unter normalen Betriebsbedingungenkeine grösseren Probleme mehr darstellt, so ergeben sich unter Betriebsbedingungen mit sehr plötzlichen, häufigen und starken Lastwechseln des Motors häufig Schwierigkeiten.Although the correct setting of the air-gas ratio in modern large diesel engines under normal operating conditions is no longer a major problem, so often arise under operating conditions with very sudden, frequent and heavy load changes of the engine difficulties.
Als ein Beispiel sei hier genannt, wenn ein von einem Grossdieselmotor angetriebenes Schiff in schweren Seegang gerät. Dies kann zur Folge haben, dass die von dem Motor direkt angetriebene Schiffsschraube durch den hohen Wellengang mehr oder minder periodisch teilweise oder sogar ganz aus dem Wasser herauskommt, um anschliessend wieder vollständig einzutauchen. Dies hat natürlich sehr grosse und plötzliche Lastwechsel des Motors, bzw. des vom Motor auf das Wasser übertragenen Antriebsdrehmoments zur Folge. Da das Turboladersystem zur Bereitstellung der Spülluft phasenverschoben auf den Lastwechsel des Motors reagiert, kann es in solchen Betriebszuständen sehr leicht passieren, dass das Luft-Gas-Gemisch im Zylinder aufgrund eines zu niedrigen Spülluftdrucks zu fett wird, was dann zu einer schnellen oder klopfenden Verbrennung führt, die natürlich nachteilig ist. Solche schnellen und plötzlichen Lastwechsel sind im Gasmodus in der Praxis nur sehr schwer oder gar nicht mehr regelbar, sodass beispielsweise ein Herunterfahren der Motorleistung oder eine ständige Änderung bzw. Anpassung der Motordrehzahl notwendig wird oder aber ein Wechsel vom Gasmodus in den Flüssigmodus.Bei einem Grossdieselmotor, der im Flüssigmodus beispielsweise mit Schweröl betrieben wird, ist es jedoch aufgrund der geltenden Abgasbestimmungen gar nicht mehr zulässig, ihn in Küstennähe im Flüssigmodus zu betreiben, weil sich im Flüssigmodus die Abgasgrenzwerte nicht mehr einhalten lassen.An example of this is when a ship powered by a large diesel engine gets into rough seas. This can have the consequence that the ship's propeller, which is directly driven by the engine, comes out more or less periodically partly or even completely out of the water due to the high waves, in order subsequently to completely submerge again. This has of course very large and sudden load changes of the engine, or of the motor transmitted to the water drive torque result. Since the turbocharger system reacts out of phase with the engine to provide the purge air, it can easily happen in such operating conditions that the air-gas mixture in the cylinder becomes too rich due to an excessively low purge pressure, which then leads to rapid or knocking combustion leads, which is of course disadvantageous. Such rapid and sudden load changes are very difficult or even impossible to control in gas mode in practice, so that, for example, a shutdown of engine power or a constant change or adjustment of the engine speed is necessary or a change from gas mode to liquid mode. In a large diesel engine However, in the liquid mode, for example, is operated with heavy oil, but it is no longer permissible to operate it near the coast in liquid mode due to the applicable exhaust gas regulations, because in the liquid mode, the exhaust limits can no longer be met.
Ein anderes Beispiel, bei welchem sehr plötzliche, häufige oder starke Lastwechsel des Motors auftreten können, ist der Manövrierbetrieb eines Schiffes.Another example, where very sudden, frequent or heavy load changes of the engine can occur, is the maneuvering operation of a ship.
Ausgehend von diesem Stand der Technik ist es daher eine Aufgabe der Erfindung, ein Verfahren zum Betreiben eines Grossdieselmotors vorzuschlagen, mit welchem der Grossdieselmotor auch bei plötzlichen, häufigen oder starken Laständerungen, wie sie beispielsweise bei einem Schiff im schweren Seegang oder im Manövrierbetrieb auftreten, noch zuverlässig, effizient und umweltfreundlich betrieben werden kann. Ferner ist es eine Aufgabe der Erfindung, einen entsprechenden Grossdieselmotor vorzuschlagen.Based on this prior art, it is therefore an object of the invention to propose a method for operating a large diesel engine, with which the large diesel engine even with sudden, frequent or heavy load changes, such as occur in a ship in heavy seas or in maneuvering, yet reliable, efficient and environmentally friendly. Furthermore, it is an object of the invention to propose a corresponding large diesel engine.
Die diese Aufgabe lösenden Gegenstände der Erfindung sind durch die Merkmale des unabhängigen Patentanspruchs der jeweiligen Kategorie gekennzeichnet.The object of the invention solving this object are characterized by the features of the independent claim of each category.
Erfindungsgemäss wird also ein Verfahren zum Betreiben eines Grossdieselmotors vorgeschlagen, welcher zumindest in einem Gasmodus betreibar ist, in welchem ein Gas als Brennstoff in einen Zylinder eingebracht wird, wobei während des Betriebs im Gasmodus ein Zustand starker Lastwechsel detektiert wird und dann der Grossdieselmotor in einem Transientmodus betrieben wird, der die folgenden Schritte umfasst:
- Festlegen eines Sollwertes für die Drehzahl oder das Drehmoment des Motors
- Bestimmen einer Obergrenze für die Menge an Gas, die pro Arbeitszyklus des Grossdieselmotors als Brennstoff bereitgestellt wird,
- Bestimmen einer Zusatzmenge eines flüssigen Brennstoffs, der zusätzlich zu dem Gas in den Brennraum eingebracht wird, wobei die Zusatzmenge so bemessen ist, dass der Sollwert für die Drehzahl realisiert wird.
- Defining a setpoint for the speed or the torque of the motor
- Determining an upper limit to the amount of gas provided as fuel per duty cycle of the large diesel engine,
- Determining an additional amount of a liquid fuel, which is introduced into the combustion chamber in addition to the gas, wherein the additional amount is dimensioned so that the target value for the rotational speed is realized.
Dadurch, dass die Menge des zugeführten Gases auf eine Obergrenze beschränkt wird, die so bemessen ist, dass die Verbrennung des Luft-Gas-Gemisches im Zylinder nicht in den Bereich einer zu schnellen oder klopfenden Verbrennung gelangt, ist es möglich den Gasmodus auch bei plötzlichen, häufigen oder periodischen Lastwechseln oder Laständerungen weiter zu benutzen, ohne dass die Gefahr eines ineffizienten, schadstoffreichen und unwirtschaftlichen Betriebs resultiert. Die aufgrund der beschränkten oder reduzierten Gaszufuhr fehlende Leistung zum Erreichen der gewünschten Soll-Drehzahl wird dann dadurch generiert, dass im Transientmodus zusätzlich zu dem Gas eine vorbestimmte Menge an flüssigem Brennstoff in den Zylinder eingebracht wird, deren Verbrennung die fehlende Energie bzw. Leistung liefert.By limiting the amount of gas supplied to an upper limit, which is such that the combustion of the air-gas mixture in the cylinder does not fall within the range of too fast or knocking combustion, it is possible to use the gas mode even in the case of sudden combustion , frequent or periodic load changes or load changes continue to be used without the risk of inefficient, polluting and uneconomic operation. The lack of power due to the limited or reduced gas supply to achieve the desired setpoint speed is then generated by introducing in transient mode, in addition to the gas, a predetermined amount of liquid fuel into the cylinder, the combustion of which provides the lack of power.
Durch das erfindungsgemässe Verfahren ist es somit möglich, eine ähnliche Lastantwort in einem Grossdieselmotors,zu realisieren, der zumindest in einem Gasmodus betreibar ist, wie in einem Grossdieselmotor, der nur im Flüssigmodus betrieben wird. Dies wird dadurch möglich, dass das Luft-Gas-Gemisch im Zylinder nicht zu fett werden kann und die zusätzliche Verbrennung des flüssigen Brennstoffs, die in der Regel nach dem Diesel-Prinzip erfolgt, wesentlich weniger empfindlich auf Änderungen im Spülluftdruck reagiert.By the method according to the invention it is thus possible to realize a similar load response in a large diesel engine, which is operable at least in a gas mode, as in a large diesel engine, which is operated only in liquid mode. This is made possible by the fact that the air-gas mixture in the cylinder can not be too rich and the additional combustion of the liquid fuel, which is usually done on the diesel principle, much less sensitive to changes in the purge air pressure.
Vorzugsweise ist der Grossdieselmotor als Dual-Fuel Motor zur Verbrennung eines Gases und zur Verbrennung eines flüssigen Brennstoffs, insbesondere Diesel oder Schweröl, ausgestaltet. Durch das erfindungsgemässe Verfahren wird es somit ermöglicht, dass ein Dual-Fuel Motor selbst bei plötzlichen und häufigen Lastwechseln noch effizient im Gasmodus betrieben werden kann. Im Falle des wichtigen Anwendungsbeispiels eines Grossdieselmotors als Antriebsaggregat eines Schiffes bedeutet, dies dass auch bei schwerem Seegang des Gasmodus weiterhin effizient genutzt werden kann. Durch das erfindungsgemässe Verfahren erhöht sich die Laufruhe des Motors und die Geschwindigkeitsfluktuationen werden deutlich reduziert.The large diesel engine is preferably designed as a dual-fuel engine for combustion of a gas and for combustion of a liquid fuel, in particular diesel or heavy oil. The method according to the invention thus makes it possible for a dual-fuel engine to be operated efficiently even in the case of sudden and frequent load changes in the gas mode. In the case of the important application example of a large diesel engine as the drive unit of a ship, this means that it can continue to be used efficiently even in heavy seas of the gas mode. The inventive method increases the smoothness of the engine and the speed fluctuations are significantly reduced.
Es ist vorteilhaft, wenn der jeweils aktuelle zur Verfügung stehende Druck der Spülluft zur Bestimmung der Obergrenze für die Menge an Gas herangezogen wird. Somit lässt sich der Anteil, der auf der Verbrennung des Gases beruht, optimieren.It is advantageous if the respective current available pressure of the scavenging air is used to determine the upper limit for the amount of gas. Thus, the proportion based on the combustion of the gas can be optimized.
Gemäss einer ersten Ausführungsform wird der Transientmodus manuell eingeleitet. So kann beispielsweise auf einem Schiff das Bedienpersonal beim Eintreten von schwerem Seegang den Transientmodus des Motors aktivieren. Es ist bevorzugt, wenn alternativ oder ergänzend der Transientmodus in Abhängigkeit von mindestens einem der folgenden Parameter eingeleitet wird: aktueller Druck der Spülluft, Zylinderdruck, berechnetes Luft-zu-Gas-Verhältnis, Signal eines Klopfdetektors, Verhältnis aus Drehzahl zu Last des Motors, Änderung des Verhältnisses aus Drehzahl zu Last des Motors, Drehmoment des Motors, Änderung des Drehmoments, Menge des benötigten Brennstoffs für die Einspritzung, Änderung der Menge des benötigten Brennstoffs für die Einspritzung. Die kontinuierliche oder regelmässige Bestimmung mindestens einer dieser Parameter ermöglicht auch eine automatische Aktivierung des Transientmodus.According to a first embodiment, the transient mode is initiated manually. For example, on a ship the operator can activate the transient mode of the engine when heavy swell occurs. It is preferred if, alternatively or additionally, the transient mode is initiated as a function of at least one of the following parameters: current pressure of the purge air, cylinder pressure, calculated air-to-gas ratio, signal of a knock detector, ratio of engine speed to load, change the ratio of engine speed to load, engine torque, torque change, amount of fuel needed for injection, change in amount of fuel needed for injection. The continuous or regular determination of at least one of these parameters also allows automatic activation of the transient mode.
Um im Transientmodus die Zusatzmenge des flüssigen Brennstoffs in den Brennraum einzubringen, gibt es mehrere bevorzugte Varianten:
Die Zusatzmenge des flüssigen Brennstoffs kann mittels einer Einspritzvorrichtung in den Brennraum eingebracht werden, welches in einem Flüssigmodus des Grossdieselmotors verwendet wird.To introduce the additional amount of liquid fuel into the combustion chamber in transient mode, there are several preferred variants:
The additional amount of the liquid fuel can be introduced by means of an injection device into the combustion chamber, which is used in a liquid mode of the large diesel engine.
Die Zusatzmenge des flüssigen Brennstoffs kann mittels einer Piloteinspritzvorrichtung in den Brennraum eingebracht werden, welche im Gasmodus zur Zündung des Gases verwendet wird.The additional amount of the liquid fuel can be introduced by means of a pilot injection device into the combustion chamber, which is used in the gas mode for igniting the gas.
Die Zusatzmenge des flüssigen Brennstoffs kann mittels einer separaten Einspritzvorrichtung in den Brennraum eingebracht werden, welche für den Transientmodus vorgesehen ist.The additional amount of the liquid fuel can be introduced by means of a separate injection device into the combustion chamber, which is provided for the transient mode.
Auch bezüglich der Zuführung des Gases in den Brennraum gibt es mehrere bevorzugte Varianten:
Die Zuführung des Gases in den Zylinder kann durch einen Zylinderliner hindurch erfolgen Hierzu sind an sich bekannte Gaszuführsysteme bekannt, die an der Wandung des Zylinders vorgesehen sind und das Gas durch den Zylinderliner in den Innenraum des Zylinders einbringen. Solche Gaszuführsysteme sind vorzugsweise so angeordnet, dass sie das Gas an einer Stelle in den Zylinder einbringen, die vom oberen oder unteren Totpunkt des Kolbens im Zylinder eine Entfernung hat, insbesondere eine solche, die 40%-60%, vorzugsweise 50%, des Abstands zwischen dem oberem Totpunkt und dem unterem Totpunkt beträgt .Also with regard to the supply of the gas into the combustion chamber, there are several preferred variants:
The supply of the gas into the cylinder can take place through a cylinder liner. Known gas supply systems are known per se, which are provided on the wall of the cylinder and introduce the gas through the cylinder liner into the interior of the cylinder. Such gas supply systems are preferably arranged to introduce the gas at a location in the cylinder which has a distance from the top or bottom dead center of the piston in the cylinder, in particular one which 40% -60%, preferably 50%, of the distance between the top dead center and the bottom dead center.
Die Zuführung des Gases in den Zylinder kann auch an einem Zylinderkopf erfolgen. Auch hierfür sind Gaszuführsysteme bekanntThe supply of the gas into the cylinder can also be done on a cylinder head. Also for this gas supply systems are known
Auch ist es möglich, dass das Gas der Spülluft zugeführt wird, bevor die Spülluft in den Zylinder eingebracht wird oder wenn die Spülluft in den Zylinder eingebracht wird. Die letztgenannte Variante kann insbesondere auch so realisiert werden, dass eine oder mehrere Gaseinlassdüsen an einem bzw. an mehreren Stege(n) vorgesehen sind, die benachbarte Spülluftöffnungen oder Spülluftschlitze voneinander trennen.It is also possible for the gas to be supplied to the purging air before the purging air is introduced into the cylinder or when the purging air is introduced into the cylinder. The last-mentioned variant can in particular also be realized in such a way that one or more gas inlet nozzles are provided on one or more webs which separate adjacent scavenging air openings or scavenging air slots from one another.
Erfindungsgemäss wird ferner ein Grossdieselmotor vorgeschlagen, welcher zumindest in einem Gasmodus betreibar ist und welcher nach einem erfindungsgemässen Verfahren betrieben wird. Die hieraus resultierenden Vorteile entsprechen den voranstehenden Erläuterungen des erfindungsgemässen Verfahrens.According to the invention, a large diesel engine is also proposed, which is operable at least in a gas mode and which is operated according to a method according to the invention. The resulting advantages correspond to the above explanations of the inventive method.
Vorzugsweise ist der Grossdieselmotor als Dual-Fuel Motor zur Verbrennung eines Gases und zur Verbrennung eines flüssigen Brennstoffs, insbesondere Diesel oder Schweröl, ausgestaltet.The large diesel engine is preferably designed as a dual-fuel engine for combustion of a gas and for combustion of a liquid fuel, in particular diesel or heavy oil.
In einer bevorzugten Ausführungsform ist eine Motorensteuerung vorgesehen, welche eine Kontrolleinrichtung zum Einleiten und Durchführen des Transientmodus umfasst.In a preferred embodiment, a motor control is provided which comprises a control device for initiating and executing the transient mode.
Ferner wird erfindungsgemäss die Verwendung eines erfindungsgemässen Verfahrens zur Nachrüstung eines Grossdieselmotors, insbesondere eines Duel-Fuel Motors vorgeschlagen. Da sich das erfindungsgemässe Verfahren in vielen Fällen ohne grösseren zusätzlichen apparativen Aufwand realisieren lässt, ist es insbesondere auch dafür geeignet, bereits existierende Grossdieselmotoren umzurüsten bzw. nachzurüsten, damit diese insbesondere bei häufigen und plötzlich auftretenden Laständerungen, beispielsweise bei schwerem Seegang, effizient, sicher und umweltfreundlich betrieben werden können.Furthermore, according to the invention, the use of a method according to the invention for retrofitting a large diesel engine, in particular a duel-fuel engine, is proposed. Since the inventive method can be implemented in many cases without major additional equipment expense, it is particularly suitable for retrofitting already existing large diesel engines or retrofit, so this particular efficient in frequent and sudden load changes, for example in heavy seas, efficiently can be operated environmentally friendly.
Weitere vorteilhafte Massnahmen und Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.Further advantageous measures and embodiments of the invention will become apparent from the dependent claims.
Im Folgenden wird die Erfindung sowohl in apparativer als auch in verfahrenstechnischer Hinsicht anhand von Ausführungsbeispielen und anhand der Zeichnung näher erläutert. In der Zeichnung zeigen:
- Fig. 1:
- ein schematische Darstellung zur Veranschaulichung der Abhängigkeit des Drehmoments vom Luft-Gas Verhältnis in einem Ausführungsbeispiel eines Grossdieselmotors, Ausführungsbeispiels der Erfindung,
- Fig.2:
- eine schematische Darstellung eines Ausführungsbeispiels eines erfindungsgemässen Verfahrens, und
- Fig. 3:
- eine schematische beispielhafte Darstellung des zeitlichen Verlaufs des Drehmoments.
- Fig. 1:
- 1 is a schematic illustration for illustrating the dependence of the torque on the air-gas ratio in an exemplary embodiment of a large diesel engine, embodiment of the invention,
- Figure 2:
- a schematic representation of an embodiment of a method according to the invention, and
- 3:
- a schematic exemplary representation of the time course of the torque.
Bei der folgenden Beschreibung der Erfindung anhand eines Ausführungsbeispiels wird mit beispielhaftem Charakter auf den für die Praxis besonders wichtigen Fall eines Grossdieselmotors Bezug genommen, der als Dual-Fuel Motor ausgestaltet ist, also als ein Motor, der mit zwei unterschiedlichen Brennstoffen betrieben werden kann. Im speziellen kann dieses Ausführungsbeispiel des Grossdieselmotors in einem Flüssigmodus betrieben werden, in welchem nur ein flüssiger Brennstoff in einen Brennraum eines Zylinders eingespritzt wird. Üblicherweise wird der flüssige Brennstoff, beispielsweise Schweröl oder ein Dieselöl zu einem geeigneten Zeitpunkt direkt in den Brennraum eingespritzt und entzündet sich dort nach dem Diesel-Prinzip der Selbstzündung. Der Grossdieselmotor kann aber auch in einem Gasmodus betrieben werden, bei dem ein als Brennstoff dienendes Gas, beispielsweise Erdgas, in Form eines Luft-Gas-Gemisches im Brennraum zur Zündung gebracht wird. Im speziellen arbeitet der Grossdieselmotor im Gasmodus nach einem Niederdruckverfahren, d.h. das Gas wird im gasförmigen Zustand in den Zylinder eingebracht. Die Vermischung mit der Luft kann dabei im Zylinder selbst erfolgen oder auch schon vor dem Zylinder. Das Luft-Gas-Gemisch wird im Brennraum nach dem Otto-Prinzip fremdgezündet. Diese Fremdzündung wird üblicherweise dadurch bewirkt, dass zu einem geeigneten Moment eine kleine Menge flüssiger Brennstoff in den Brennraum eingebracht wird, der sich dann selbstentzündet und dadurch die Fremdzündung des Luft-Gas-Gemisches verursacht.In the following description of the invention with reference to an embodiment is taken by way of example character in the case of a particularly important case of a large diesel engine, which is designed as a dual-fuel engine, ie as a motor that can be operated with two different fuels. In particular, this embodiment of the large diesel engine can be operated in a liquid mode in which only a liquid fuel is injected into a combustion chamber of a cylinder. Usually, the liquid fuel, such as heavy oil or diesel oil injected at a suitable time directly into the combustion chamber and ignites there according to the diesel principle of auto-ignition. The large diesel engine can also be operated in a gas mode in which serving as a fuel gas, such as natural gas, is brought in the form of an air-gas mixture in the combustion chamber for ignition. In particular, the large diesel engine operates in gas mode according to a low-pressure method, ie the gas is introduced into the cylinder in the gaseous state. The mixing with the air can take place in the cylinder itself or even before the cylinder. The air-gas mixture is in the combustion chamber after the Otto-Principle externally ignited. This spark ignition is usually caused by the fact that at a suitable moment a small amount of liquid fuel is introduced into the combustion chamber, which then self-ignites and thereby causes the spark ignition of the air-gas mixture.
Der Grossdieselmotor kann sowohl als Viertakt-Motor als auch als Zweitaktmotor ausgestaltet sein. Bei dem hier beschriebenen Ausführungsbeispiel ist der Grossdieselmotor als längsgespülter Zweitakt-Grossdieselmotor ausgestaltet, der im Flüssigmodus mit einem Common-Rail System arbeitet.The large diesel engine can be configured both as a four-stroke engine and as a two-stroke engine. In the embodiment described here, the large diesel engine is designed as a longitudinally flushed two-stroke large diesel engine, which operates in liquid mode with a common rail system.
Der Aufbau und die einzelnen Komponenten eines Grossdieselmotors, wie beispielsweise das Einspritzsystem für den Flüssigmodus, das Gaszuführsystem für den Gasmodus, das Gaswechselsystem, das Abgassystem oder das Turboladersystem für die Bereitstellung der Spül- bzw. Ladeluft, sowie die Kontroll- und Steuerungssystem für einen Grossdieselmotor sind dem Fachmann sowohl für die Ausgestaltung als Zweitaktmotor als auch für die Ausgestaltung als Viertaktmotor hinlänglich bekannt und bedürfen daher hier keiner weiteren Erläuterung.The design and components of a large diesel engine, such as the liquid mode injection system, the gas mode gas supply system, the gas exchange system, the exhaust system or the turbocharger system for providing the charge air, and the control and control system for a large diesel engine The skilled worker is well known both for the design as a two-stroke engine and for the design as a four-stroke engine and therefore need no further explanation here.
Bei dem hier beschriebenen Ausführungsbeispiel eines längsgespülten Zweitakt-Grossdieselmotors sind üblicherweise im unteren Bereich eines jeden Zylinders bzw. Zylinderliners Spülluftschlitze vorgesehen, die durch die Bewegung des Kolbens im Zylinder periodisch verschlossen und geöffnet werden, sodass die von dem Turbolader unter einem Ladedruck bereitgestellte Spülluft durch die Spülluftschlitze in den Zylinder einströmen kann, solange diese geöffnet sind. Im Zylinderkopf bzw. im Zylinderdeckel ist ein meistens zentral angeordnetes Auslassventil vorgesehen, durch welches die Verbrennungsgase nach dem Brennprozess aus dem Zylinder in das Abgassystem ausgetragen werden können. Für das Einbringen des flüssigen Brennstoffs sind ein oder mehrere Brennstoffeinspritzdüsen vorgesehen, die beispielsweise im Zylinderkopf in der Nähe des Auslassventils angeordnet sind. Für die Gaszuführung im Gasmodus ist ein Gaszuführsystem vorgesehen, das mindestens ein Gaseinlassventil mit einer Gaseinlassdüse umfasst. Die Gaseinlassdüse ist typischerweise in der Wandung des Zylinders vorgesehen, beispielsweise auf einer Höhe, die etwa in der Mitte zwischen dem oberen und dem unteren Totpunkt des Kolbens liegt.In the embodiment described here of a longitudinally purged two-stroke large diesel engine usually scavenging air slots are provided in the lower region of each cylinder or cylinder liner, which are periodically closed and opened by the movement of the piston in the cylinder, so that provided by the turbocharger under a boost pressure scavenging air through the Purging air slots can flow into the cylinder, as long as they are open. In the cylinder head or in the cylinder cover a usually centrally arranged exhaust valve is provided, through which the combustion gases can be discharged after the firing process from the cylinder into the exhaust system. For the introduction of the liquid fuel one or more fuel injection nozzles are provided, which are arranged for example in the cylinder head in the vicinity of the exhaust valve. For the gas supply in the gas mode, a gas supply system is provided which comprises at least one gas inlet valve with a gas inlet nozzle. The gas inlet nozzle is typically in the wall of the Cylinder provided, for example, at a height which is approximately in the middle between the top and bottom dead center of the piston.
Ferner wird im Folgenden beispielhaft auf den Anwendungsfall Bezug genommen, dass der Grossdieselmotor das Antriebsaggregat eines Schiffes ist.Furthermore, reference will be made below by way of example to the application in that the large diesel engine is the drive unit of a ship.
Aufgrund der gesetzlichen Bestimmungen bezüglich der Abgaswerte müssen heute Grossdieselmotoren in Küstennähe häufig im Gasmodus betrieben werden, weil sonst die vorgeschriebenen Grenzwerte für den Abgasausstoss, insbesondere sind dies Stickoxide NOx und Schwefeldioxide, nicht mehr eingehalten werden können.Due to the legal provisions regarding exhaust emissions today large diesel engines near the coast often have to be operated in gas mode, because otherwise the prescribed limits for the exhaust emissions, in particular nitrogen oxides NO x and sulfur dioxides, can no longer be met.
Im Gasmodus sind die Effizienz und die möglichst schadstoffarme Verbrennung des Luft-Gas-Gemisches ganz empfindlich von dem Verhältnis der Menge an Luft und der Menge an Gas abhängig. Dieses Verhältnis wird üblicherweise durch den λ-Wert angegeben, welcher das Verhältnis aus der Masse der für die Verbrennung zur Verfügung stehenden Luft und der Masse des Gases angibt, welches als Brennstoff verwendet wird.In gas mode, the efficiency and low-emission combustion of the air-gas mixture are very sensitive to the ratio of the amount of air and the amount of gas. This ratio is usually expressed by the λ value, which is the ratio of the mass of air available for combustion and the mass of gas used as the fuel.
Das optimale Luft-zu-Gas Verhältnis hängt von dem vom Motor zu generierenden Antriebsdrehmoment ab und damit von der gewünschten Geschwindigkeit des Schiffes. Da Grossdieselmotoren üblicherweise direkt mit der Schiffschraube des Schiffes verbunden sind, entspricht jeder Geschwindigkeit eine Drehzahl des Motors.The optimum air-to-gas ratio depends on the drive torque to be generated by the engine and thus on the desired speed of the ship. Since large diesel engines are usually connected directly to the ship's propeller, each speed corresponds to a speed of the engine.
In der Darstellung in
Daher ist man bemüht, den Grossdieselmotor stets an einem optimalen Punkt 5 für das Luft-zu-Gas Verhältnis zu betreiben. In der Praxis sind natürliche Schwankungen des Drehmoments bzw. des Luft-zu-Gas-Verhältnisses 1 auch bei konstanter Drehzahl bzw. konstanter Geschwindigkeit des Schiffes nicht zu vermeiden bzw. nicht regelbar, daher gibt es einen Toleranzbereich 6, der in
Wenn nun das Schiff aus ruhigem Wasser (worauf sich
Da im schweren Seegang diese starken Fluktuationen der Motorlast häufig hintereinander, näherungsweise periodisch auftreten, ist somit ein effizienter, wirtschaftlicher und schadstoffarmer Betrieb des Grossdieselmotors im Gasmodus nicht mehr möglich.Since heavy fluctuations in engine load frequently occur in succession, approximately periodically, in heavy seas, an efficient, economical and low-emission operation of the large diesel engine in gas mode is no longer possible.
Dem wird durch das erfindungsgemässe Verfahren Abhilfe geschaffen.
Besonders bevorzugt wird der momentan zur Verfügung stehende Ladedruck der Spülluft für die Bestimmung der Obergrenze der Menge an Gas herangezogen. Dieser Ladedruck wird üblicherweise in einem Grossdieselmotor messtechnisch erfasst und steht somit in der Kontrolleinrichtung zur Verfügung bzw. kann an diese übermittelt werden. Insbesondere kann dabei die Bestimmung der Obergrenze für die Gasmenge mit Hilfe der Differenz aus dem momentanen Wert des zur Verfügung stehenden Ladedrucks der Spülluft und dem benötigten Ladedruck der Spülluft bestimmt werden. Der benötigte Ladedruck für die aktuellen Betriebsparameter ist beispielsweise in look-up-Tabellen oder -Matrizen gespeichert.Particularly preferably, the currently available boost pressure of the scavenging air is used for determining the upper limit of the amount of gas. This charge pressure is usually detected by measurement in a large diesel engine and is thus available in the control device or can be transmitted to it. In particular, the determination of the upper limit for the gas quantity can be determined with the aid of the difference between the instantaneous value of the available charge pressure of the purging air and the required charge pressure of the purging air. The required boost pressure for the current operating parameters is stored, for example, in look-up tables or matrices.
Die Kontrolleinrichtung umfasst dann eine vom Ladedruck abhängige Obergrenze für die Gasmenge, die dem Zylinder als Brenngas zugeführt werden kann und begrenzt die Menge an Gas auf diese Obergrenze. Damit nun die Drehzahl oder das vom Motor generierte Drehmoment auf dem Sollwert gehalten werden kann, wird von der Kontrolleinrichtung im Schritt 14 ferner eine Zusatzmenge an flüssigem Brennstoff bestimmt, die so bemessen ist, dass sie die Differenz zwischen dem Sollwert für die Drehzahl oder das Drehmoment und dem mit der maximalen Gasmenge erzielbaren Wert ausgleicht.The control device then includes a charge pressure dependent upper limit for the amount of gas that can be supplied to the cylinder as fuel gas and limits the amount of gas to this upper limit. In order that the speed or the torque generated by the engine can be maintained at the desired value, the controller further determines, in
Das bedeutet, die Kontrolleinrichtung bestimmt denjenigen Wert für das Drehmoment oder die Drehzahl, der mit der durch die Obergrenze festgelegten maximalen Menge an Gas erreichbar ist. Dann wird die Differenz aus dem Sollwert und diesem Wert ermittelt. Anschliessend wird die Menge an flüssigem Brennstoff bestimmt, die benötigt wird, um diese Differenz auszugleichen.That is, the controller determines that value for the torque or speed achievable with the maximum amount of gas defined by the upper limit. Then the difference between the setpoint and this value is determined. Subsequently, the amount of liquid fuel needed to make up for this difference is determined.
Nun wird die ermittelte Menge an Gas im Schritt 15 in den Zylinder eingebracht und dort wie im Gasmodus zur Verbrennung gebracht. Gleichzeitig, d.h. im gleichen Arbeitszyklus, wird die vorgängig bestimmte Menge des flüssigen Brennstoffs im Schritt 16 in den Zylinder eingebracht und zündet sich dort selbst. Durch die gemeinsame Verbrennung des Gases und des zusätzlich eingebrachten flüssigen Brennstoffs kann somit der Sollwert für die Drehzahl oder das Drehmoment generiert werden. Die Selbstzündung des flüssigen Brennstoffs kann dabei zur Fremdzündung des Luft-Gas Gemisches verwendet werden.Now, the determined amount of gas is introduced into the cylinder in
Im Schritt 17 wird kontinuierlich oder in regelmässigen Abständen durch Beobachtungen des Betriebspersonals und/oder durch die Bestimmung von den Betriebsparametern überprüft, ob die Bedingungen für die Aktivierung des Transientmodus noch erfüllt sind. Falls ja, wird der Transientmodus beibehalten, wie dies der Pfeil 18 in
Sind bei der Überprüfung im Schritt 17 die Bedingungen für den Transientmodus nicht mehr erfüllt, so kann im Schritt 19 wieder in den normalen Gasmodus umgeschaltet werden.If, during the check in
Die Kontrolleinrichtung zum Einleiten und Durchführen des Transientmodus ist vorzugsweise in die Motorensteuerung integriert.The control device for initiating and executing the transient mode is preferably integrated in the engine control.
In dem Transientmodus wird somit durch eine Kombination der Verbrennung von Gas mit einer Verbrennung von flüssigem Brennstoff gewährleistet, dass der Sollwert für die Motorgeschwindigkeit, d.h. die Drehzahl oder der Sollwert für das Drehmoment aufrecht erhalten bleibt, ohne dass die Verbrennung des Gases im Bereich der "fast combustion" und/oder im Bereich des Klopfens und/oder im Bereich der "pre-ignition erfolgt. Durch die Obergrenze für die Menge an Gas ist gewährleistet, dass das Luft-Gas-Gemisch im Brennraum nicht zu fett wird.In the transient mode, therefore, it is ensured by a combination of the combustion of gas with the combustion of liquid fuel that the setpoint for the engine speed, i. the speed or set point for the torque is maintained without the combustion of the gas being in the range of "fast combustion" and / or knocking and / or pre-ignition on gas ensures that the air-gas mixture in the combustion chamber is not too rich.
Durch dieses Verfahren kann also beispielsweise ein Dual-Fuel Grossdieselmotor, der im Gasbetrieb nach dem Otto-Prinzip arbeitet, eine zumindest näherungsweise gleiche Lastwechsel-Antwort erreichen, wie ein nur nach dem Dieselprinzip arbeitender Grossdieselmotor, der ausschliesslich mit flüssigem Brennstoff betrieben wird. Denn einerseits ist sichergestellt, das bei dem erfindungsgemässen Verfahren bzw. bei dem erfindungsgemässen Grossdieselmotor das Luft-Gas-Gemisch nicht zu fett wird, und andererseits reagiert der zum flüssigen Brennstoff gehörende Verbrennungsanteil viel weniger empfindlich auf einen zu geringen Ladedruck der Spülluft. Somit können insbesondere in schwerer See auch beim Gasbetrieb die Laufstabilität des Grossdieselmotors verbessert werden und die Geschwindigkeitsfluktuationen reduziert werden.By this method, for example, a dual-fuel large diesel engine, which operates in gas mode according to the Otto principle, a reach at least approximately the same load change response, such as a working only on the diesel principle large diesel engine, which is operated exclusively with liquid fuel. On the one hand, it is ensured that the air-gas mixture does not become too rich in the process according to the invention or in the large diesel engine according to the invention, and on the other hand, the proportion of combustion associated with the liquid fuel is much less sensitive to an insufficient boost pressure of the scavenging air. Thus, especially in heavy seas, even in gas operation, the running stability of the large diesel engine can be improved and the speed fluctuations can be reduced.
Die schematische Darstellung in
Für die Einbringung der zusätzlichen Menge an flüssigem Brennstoff in den Brennraum des Zylinders während des Transientmodus gibt es verschiedene Möglichkeiten. Falls der Grossdieselmotor als Dual-Fuel Motor ausgestaltet ist, kann für die Einspritzung des flüssigen Brennstoffs die gleiche Einspritzvorrichtung verwendet werden, die auch im Flüssigmodus für die Einspritzung des Brennstoffs verwendet wird.For the introduction of the additional amount of liquid fuel into the combustion chamber of the cylinder during the transient mode, there are various possibilities. If the large diesel engine is designed as a dual-fuel engine, can be used for the injection of liquid fuel, the same injector used in liquid mode for the injection of the fuel.
Eine weitere Möglichkeit zum Einbringen des flüssigen Brennstoffs im Transientmodus besteht darin, dass der flüssige Brennstoff mittels einer Piloteinspritzvorrichtung in den Brennraum eingebracht wird, welche im Gasmodus zur Zündung des Luft-Gas Gemisches verwendet wird.Another possibility for introducing the liquid fuel in transient mode is that the liquid fuel is introduced by means of a pilot injection device into the combustion chamber, which is used in the gas mode for igniting the air-gas mixture.
Natürlich ist es auch möglich, dass für das Einbringen des flüssigen Brennstoffs während des Transientmodus eine separate Einspritzvorrichtung vorgesehen ist. Dies ist insbesondere bevorzugt, wenn der Grossdieselmotor nicht für den Flüssigmodus ausgestaltet ist und keine dementsprechende Einspritzvorrichtung aufweist.Of course, it is also possible that a separate injection device is provided for the introduction of the liquid fuel during the transient mode. This is particularly preferred if the large diesel engine is not designed for the liquid mode and has no corresponding injection device.
Bezüglich des Einbringens des Gases in den Brennraum des Zylinders, sowohl während des Transientmodus als auch während des Gasmodus, gibt es mehrere bevorzugte Varianten. Wie bereits voranstehend erwähnt, kann ein Gaszuführsystem mit mindestens einer Gaseinlassdüse vorgesehen sein, welche im Zylinderliner angeordnet ist, sodass das Gas in den Zylinder einbringbar ist und sich dort mit der Spülluft zu dem zündfähigen Luft-Gas Gemisch vermischt.Regarding the introduction of the gas into the combustion chamber of the cylinder, both during the transient mode and during the gas mode, there are several preferred variants. As already mentioned above, a gas supply system can be provided with at least one gas inlet nozzle, which is arranged in the cylinder liner, so that the gas can be introduced into the cylinder and mixed there with the purging air to the ignitable air-gas mixture.
Es ist aber auch möglich, eine oder mehrere Gaseinlassdüsen am Zylinderkopf bzw. am Zylinderdeckel vorzusehen, sodass die Zuführung des Gases in den Zylinder vom Zylinderkopf aus erfolgt und sich das Gas dann mit der Spülluft vermischt.But it is also possible to provide one or more gas inlet nozzles on the cylinder head or on the cylinder cover, so that the supply of gas into the cylinder takes place from the cylinder head and then mixes the gas with the scavenging air.
Eine weitere Möglichkeit besteht darin, das Gas der Spülluft zuzuführen, bevor die Spülluft in den Zylinder eingebracht wird. Das Gas vermischt sich dann bereits ausserhalb des Zylinderinnenraums mit der Spülluft zu einem Luft-Gas Gemisch, das dann in den Zylinder eingebracht wird, beispielsweise durch die Spülluftschlitze oder Spülluftöffnungen. Hierbei kann die Gaszuführung in die Spülluft an einer Stelle zwischen dem Ausgang des Turboladersystems und den Eintrittsöffnungen in den Innenraum des Zylinders, beispielsweise den Spülluftschlitzen, erfolgen.Another possibility is to supply the gas to the purging air before the purging air is introduced into the cylinder. The gas then already mixes outside the interior of the cylinder with the purging air to form an air-gas mixture, which is then introduced into the cylinder, for example through the purging air slots or purging air openings. Here, the gas supply into the scavenging air at a point between the outlet of the turbocharger system and the inlet openings in the interior of the cylinder, for example, the scavenge air slots, take place.
Insbesondere ist es auch möglich, das Gas der Spülluft dann zuzuführen,wenn die Spülluft in den Zylinder eingebracht wird. Hierzu ist es beispielsweise möglich, an einem oder mehreren Stegen, die benachbarte Spülluftschlitze trennen, jeweils eine oder mehrere Gaseinlassdüsen vorzusehen, sodass sich die Spülluft beim Durchtritt durch die Spülluftschlitze mit dem Gas durchmischt.In particular, it is also possible to supply the gas to the purging air when the purging air is introduced into the cylinder. For this purpose, it is possible, for example, to provide one or more gas inlet nozzles at one or more webs, which separate adjacent scavenging air slots, so that the scavenging air mixes with the gas as it passes through the scavenging air slots.
Die Betriebsparameter, welche im Schritt 12 (
Als Betriebsparameter für den Schritt 12 bzw. die Entscheidung im Schritt 13 eignen sich beispielsweise einer oder mehrere der folgenden Grössen: Der aktuelle Druck der Spülluft, die von dem Turboladersystem zur Verfügung gestellt wird, bzw. die Änderung dieses Druckes, der Zylinderdruck, das berechnete Luft-zu Gas-Verhältnis, Signale eines Klopfdetektors, mit welchem erkennbar ist, wenn die Verbrennung im Zylinder klopfend erfolgt, also das Luft-Gas Gemisch zu fett ist, das Verhältnis aus Drehzahl zu Last des Motors oder Änderungen in diesem Verhältnis oder das gemessene Drehmoment oder dessen zeitliche Änderung.For example, one or more of the following quantities are suitable as operating parameters for
Das erfindungsgemässe Verfahren lässt sich insbesondere auch dazu verwenden, um bereits bestehende Grossdieselmotoren, insbesondere Dual-Fuel Motoren, nachzurüsten. Da in solchen Grossdieselmotoren die apparativen Voraussetzungen zur Durchführung eines erfindungsgemässen Verfahrens häufig schon erfüllt sind oder mit geringem Aufwand bzw. Umbau realisierbar sind, ist es oft möglich, den Grossdieselmotor durch entsprechende Anpassungen oder Ergänzungen in der Motorensteuerung für den Transientbetrieb bereit zu machen. Diese Möglichkeit der Nachrüstung ist insbesondere auch im Hinblick auf die Einhaltung der Emissionsgrenzwerte ein grosser Vorteil.The inventive method can also be used in particular to retrofit existing large diesel engines, especially dual-fuel engines. Since in such large diesel engines the apparatus requirements for carrying out a method according to the invention are often already met or can be realized with little effort or conversion, it is often possible to make the large diesel engine ready for transient operation by appropriate adjustments or additions in the engine control. This possibility of retrofitting is a great advantage, especially with regard to compliance with the emission limit values.
Claims (15)
- A method for operating a large diesel engine, which is operable at least in a gas mode in which a gas is introduced as fuel into a cylinder, wherein during operation in the gas mode (10) a state of strong load change is detected (13) and then the large diesel engine is operated in a transient mode comprising the following steps:- defining a desired value for the rotational speed or torque of the engine- determining an upper limit for the amount of gas (14) provided as fuel per operating cycle of the large diesel engine,- determining an additive amount of a liquid fuel (14) introduced into the combustion chamber in addition to the gas, the additive amount being dimensioned such that the desired value for the rotational speed is realized.
- A method according to claim 1, in which the large diesel engine is designed as a dual-fuel engine for the combustion of a gas and for the combustion of a liquid fuel, in particular diesel or heavy fuel oil.
- A method according to anyone of the preceding claims, in which the respectively current available pressure of the scavenging air is used to determine the upper limit for the amount of gas (14).
- A method according to anyone of the preceding claims, in which the transient mode is initiated manually.
- A method according to anyone of the preceding claims, in which the transient mode is initiated in dependence on at least one of the following parameters: current pressure of the scavenging air, cylinder pressure, calculated air-to-gas ratio, signal of a knock detector, ratio of rotational speed to load of the engine, change in the ratio of rotational speed to load of the engine, torque of the engine, change in torque, amount of fuel required for injection, change in amount of fuel required for injection.
- A method according to anyone of the preceding claims, in which the additive amount of the liquid fuel is introduced into the combustion chamber by means of an injection device which is used in a liquid mode of the large diesel engine.
- A method according to anyone of the preceding claims, in which the additive amount of the liquid fuel is introduced into the combustion chamber by means of a pilot injection device which is used in the gas mode for igniting the gas.
- A method according to anyone of the preceding claims, in which the additive amount of the liquid fuel is introduced into the combustion chamber by means of a separate injection device which is provided for transient mode.
- A method according to anyone of the preceding claims, in which the supply of the gas into the cylinder takes place through a cylinder liner.
- A method according to anyone of the preceding claims, in which the supply of the gas into the cylinder takes place at a cylinder head.
- A method according to anyone of the preceding claims, in which the gas is supplied to the scavenging air before the scavenging air is introduced into the cylinder or when the scavenging air is introduced into the cylinder.
- A large diesel engine, which is operable at least in a gas mode (10) and which is operated according to a method according to anyone of the preceding claims.
- A large diesel engine according to claim 12, which is designed as a dual-fuel engine for the combustion of a gas and for the combustion of a liquid fuel, in particular diesel or heavy fuel oil.
- A large diesel engine according to anyone of the claims 12 or 13, in which an engine control system is provided, which comprises a control device (14) for initiating and performing the transient mode.
- An use of a method according to anyone of the claims 1 to 11 for retrofitting a large diesel engine, in particular a dual-fuel engine.
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EP (1) | EP3121428B1 (en) |
JP (2) | JP7122799B2 (en) |
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EP3121428B1 (en) * | 2015-05-19 | 2019-07-17 | Winterthur Gas & Diesel AG | Method for operating a large diesel engine, use of this method and large diesel engine |
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WO2020249845A1 (en) * | 2019-06-14 | 2020-12-17 | Wärtsilä Finland Oy | Method of operating piston engine and control system for piston engine |
CN115217642B (en) * | 2022-06-30 | 2024-05-17 | 潍柴动力股份有限公司 | Control method and control device for dual-fuel engine |
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CN106168175B (en) | 2021-09-17 |
JP7122799B2 (en) | 2022-08-22 |
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KR20160136231A (en) | 2016-11-29 |
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